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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1674536f1b08110a2750a1d25464354b1cc595b731d387ac222e5af769a17756' 
  AND token = 'WH8UHvaL7DNBZ5Fh6vHbqWmWjoUx6a7Q8tF7vUzl+l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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