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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5bd7b86e322cb9087fd5357f2b28b411a7c6ce3a406ff67d66238b1df11639' 
  AND token = 'rEnqHCc1p9rnReULLv9LiJw42InAH9crnIpVlZodL4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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