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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07702860703771344c380f13ccb6a684b5053c4db8b811230c2619375edc8ff3' 
  AND token = 'Vx645BNU8lTQXNdJFf67+IhCCyULbCMLBm8cK0NQ6FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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