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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581028914cddac6adb0bacde10df22d9f0c6d9e5d18ca97464294d84b1906d6b' 
  AND token = 'zxgOrmPdz6DbWP23pm57OJiwcePCt+bbne0ikIbZ6hU=' 
  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"
    }
  }
}