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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083eed7eeab726fc6a5cf09fffa5ff3a38ad90d1a7e96345047ecea4690e0b60' 
  AND token = 'bjoq8EVRU1SoTYO6Lyupya4Jop+IFBIPI3ww7UxXNk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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