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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ede50ab9481b0e301a435f1caa2a18bb907beb52539254680a39adabea6bb91' 
  AND token = 'wz3WIgdhsZxciKBPnH+qysFaAU111a0C1X66PzAzdsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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