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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8460add11bbc09e9556fe340daceaf98b4cab3861b4a54b7fffcf5c5af170c' 
  AND token = 'rRq+Kw5jq3H1gk9xIBPl5zK5U/oRbHqcpY4MSVqjPjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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