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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d3f83251e50d99ed3ebb7a8c2813f54a0f69b9424a48ce0b2ef2457744e539' 
  AND token = 'BGyySugyflnsAGed3WAu1cxmLs0jnxMq9k97118T6r0=' 
  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"
    }
  }
}