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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da88b569d2331867e8e69fb1873122e6f82d17dc04853ef82746e0ff40e60de' 
  AND token = '34aRXOaYfc/VZfOf93iE972xGSxyreYotJ2n71Hxl+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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