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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5eb53f521e74d9a6b004392e9a4b642a4d913c1480f7fd7bcd7cffa07c98878' 
  AND token = 'AVdNkoeVjODpXhymsOQ1Ea8vX7GwTt/n/fcZpDvthTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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