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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6169e053432762235436f6cc3de2b6b9c62016ae1e4172e03b7c437bbc4ee4e3' 
  AND token = '5/Z08DezcRyMkH8TDaoQut6csQuUyk/OuGMuZzOe50w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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