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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed949fd86e0bf3a97b3591eb01f193475a68e300ba0527aaea64ecbfd24416fc' 
  AND token = 'AhQ+JK3Bim4DY/h4A1j6I4HpUwJETw88LxeaMXTZv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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