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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d11811afcb08faecab1fbd41d6eda916c97384f24458691ba820c4dc07a891' 
  AND token = 'shenS8nCHg5riG0D2NpGoVwys+Vh7t9OSHXwpHRPY0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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