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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423de424d0c37340f0e37c6304408a417ddd06179e61f4c10cdd4ed3910919ec' 
  AND token = '0TVTybOJ4l86NqBDPEaamhBQ1JLEqUQbDE8x9Vs39Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}