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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2239ba80b3814eb880818fa40e7f8107d25cc64d389d197fe9d4090b84b298b' 
  AND token = 'uk5W1easNcH2iUBfScHzaFmP03iwnoPaNujIiKglpVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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