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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fa46c0703099bf7bd175d9122abb11a5499869394b0e3ef2b9a9fbc4047e76' 
  AND token = 'HeNBESUo+YUp0GN9RKT/EIrfXFK5+sX2zQtK0H0rlq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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