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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23888daff5c12026f3f2ee76304595d8033d59ed3ac8128d91b4ba5fff9772b' 
  AND token = 'WGKVEUqngjyCtX5jGVqdOT2t+RIyHyv4C60eUUabnkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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