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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abfff1ae1c78735d77e2a8bb8799117150ab315b605eb662e6f6bcaa695c98d' 
  AND token = '9XiDFqxFDRaB/ia0vxEx4XGa5NYplfFhhA7Fd7P+mo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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