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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f3c3c853b6cd10f286012568201a1da026f343d4927c0d3713c1b4772ab797' 
  AND token = '6NSS2Q3tmaHMdZxMGu7gaBb/lS7KlKOHcWLP+7aVtI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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