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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff9f0b24878a85aaa1cbff6b726d10e7130770a4e1621e211241d26b757b12b' 
  AND token = 'yK0h7WkLONL0Dy7eqMF1wAaAoFkTVNi6MkkIW3MlGBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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