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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a680ea886a901bbb0aaa529931be92dbef3e6a8d65449ab9f7f19b147a69cd7b' 
  AND token = 'wNYv4zhl7O4LDTAXmHxsUx3cXGdd/a8JhJzkXXvbnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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