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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b206d2a2b22ffb894b34ad94055273a31bbdb5a8e8a98003e14b23d56462d62f' 
  AND token = 'vYuZkisWIibNJ56j9CO3k7ERM53xC4F2x5PM5mQNPaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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