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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2db83d31f8d204767ad59aafa56c9bdb5c20e1c9d3f3dfe5a910a9c9a6bc77' 
  AND token = 'A+pZeXSKaqUM5V5G4TegVbUBcYMFl62Gn4j44kqrCmo=' 
  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"
    }
  }
}