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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bc0d700b27678dfabd9e2266636dedb96516512fbd2796eb6c2227d9ef5925' 
  AND token = '53nUVvFJpxmcBOg4Zj5O46FAXE4kkomlDn7n3NbHZTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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