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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947d6d361e8d1715ad73de197f7566a8c8bad34b497f36314f39676b940d135e' 
  AND token = 'jcKziTOIMTPp/74iZp1oDrfWSAvc1yIaebVdjGqTS54=' 
  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"
    }
  }
}