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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246edf0846988cbd28db355b0ea47545cb8792c90910b18d085c27af68cdb672' 
  AND token = '9GcCGN5WubOkdLCUe83U9iDd+eJh1BGCuZ8TSVfNruY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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