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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354f51967ba5c7792ebb96920e03a549fa6a02dbf5a451f96691d90b4fa6fe81' 
  AND token = 'wdBauYNz5EapmnA2ohyJFr/kw6gLjPSc9CrSTPN144o=' 
  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"
    }
  }
}