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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a64013bf90552a3cf94ab80b2638c55f2ccc8ffd265e6fcc58e7dbaf9b4c49' 
  AND token = '/V8S7gOfwsWehUoHJWZr6CcvG3IJz7enAse67q9iuhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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