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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23db8318b4a2ea48c0344b259eb3e39893059880023bc9241d4019370c14729' 
  AND token = 'knGdp59H0ypdFrpjWOQ0aQgk14p73bXxo3kmVmxj9i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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