SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6175c1da31a4b755a8bfc920ad5c6c3dc9c9996260426b2d2b48ff7f3c078d52' 
  AND token = 'SYC9sTICHXLf4Kg+JNDWyux0fzBZqoiZGRMTytZ98mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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