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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8c1de32b3d48d546482c9b77e86a9386d17b5c6b0bae08e8e3b55726a854fb' 
  AND token = 'lD3zcz1adLq/NBbd+pzI5wSiJy4MLMZc/t820shvtco=' 
  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"
    }
  }
}