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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497c12c7d6116f62e3c1ee4a8cddcf3065445358c2c6451c70a35b831ce60f45' 
  AND token = 'C11oZXqnHRS68HQ7hSxHzcQwy7SE3VBLD0lK2+iXlFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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