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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e70b4498b88651bf3ef674c95e6ea80b104fb49d383692cd963a426c011e90' 
  AND token = 'JqdgXticrH6Iwz81ii4ATYr+JK1ea1+xY+jYrx4aEhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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