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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2a5cc8bb2f3df2a86bb3ba9b2531a88bb125e20167b9435cbe59f31fe6c1a5' 
  AND token = 'Xwr/7f/XHNGpmgaSA8iQnxIS0+8CusX5qFQTbsJfHoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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