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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9f1fc50d6a60563cee767a2a4dd5fcedc49a8bbdb9461d403ff559a0bab919' 
  AND token = 'p/gHANXqx9b6IxWzXM55gWj/tmquVNJcamSnaYFLFOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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