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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e7241c23cd884ddb7859cdfaf702238255d45ec6e0b35f17bb8b8ad0b0072e' 
  AND token = 'kKwu9miUiG5yw9qwX3FkkJJo9yxgiR8Y8xwSjpjuPYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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