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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbda3b10fa6e199d8b67033825627e096aef19eece37da347248db4e26339c3d' 
  AND token = 'V0TGozbzt8/bZb1hWzD18EKlBAAhrhFRp+l7RO7y0js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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