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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a78e48ae9317978ea88e81a1924d7336d417cdbebe74d4e3503c4325464f89' 
  AND token = 'SkYLJYZB10VLIOr4JsixkL/rL+gQrMRcN5LKgAavV+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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