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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1bee167c9d124fc0a893d279a0b47e2863351695b879e88d2a37bea0244c54' 
  AND token = 'BiYIQ0T2Ihjp0WMbaBFuzVP/PLiEsp4kA2n0uDZIcXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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