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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655043f86b324a1dd8af4a1382df105711ddb037f60b23408831d0815e65cf9e' 
  AND token = '8z5BTCZlLzhNlZwpVixjdc/E3zBV0WcFxxj+Gc3y5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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