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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c7665d3f7991ed8f27ce655fa7df920d66f3beaa2370b0c6ed4de33689daac' 
  AND token = '6QNEG0s4gvNNDohzAq0HC2cOkwaN9auoAfeZXxs1+kw=' 
  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"
    }
  }
}