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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed0a23a75d641010bf604e2961ab4cf78f28674570a6e4884f9765f7d456e00' 
  AND token = 'bXAj3klMJ0YchRTDieqU8E1SzSLhLz9u8HAgY22aFDU=' 
  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"
    }
  }
}