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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d2816420c0dae8e4c259c8851f5f09c394ba88db98117116eeaf080f83fbf6' 
  AND token = 'mIz5jvH6mtvGfZqAE0WTNTyD+QYNOwGb6nYR0k7GT20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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