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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036a6169c88c463b4edb6b02cc5d4da3cc141d7514719530e96558961bdaeb35' 
  AND token = 'u3w6ScFN4wyslDGvLIT5N3pk9wpl/JEhdSH0WDYf7wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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