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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3f081a5c214f8caa8ab08ada31c2b525db011edcf03271320da949c7cf2609' 
  AND token = 'c9T3txlPLcLBXV6MGf5dKadBg7CtyJKZ2+ZQNRqD+7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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