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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec343683dd6d3e6b21ef250738815bfaa08d2b0fc1e4cf77fb92f169cf59dad9' 
  AND token = 'PNgkMj95hg62N5FQR7PciVVYy6XBU3pGznMHE9Q4aRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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