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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3316e5281f23e9dba5bb19307ca5ef9931c30becaf53a62e32fb5847d897d1' 
  AND token = 'u80Y1cebeajQfTA8dBpYA00Lo0rkYonUBZKyEApQBGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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