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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68789495b685a39f5c711c0c7dfeb7d041b045bf28a279b9a6171c45017842c' 
  AND token = 'SqyIzThGS+GHS2IrEYiOuIJ8EcOiLfR+aGQ/yP0lDjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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