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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a907fac402fbacf4e444c4ef9a0ad42e3a333e0420994b4727f95e7b3c2c4e58' 
  AND token = 'Hb4OWdl3BRf1lGXbm2EKcgRg8A/+yVTmeOcFd0B1DIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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