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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744b859b18bdaa5b9df6a6e1fef08c980534a5c66391a3b96c769faa09f71192' 
  AND token = '+ETx/Z6y9CsqQnZqfTWfRTStDQ+VdIqtf9t7QBFGZe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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