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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e614e2e0bfa80d7da5d5e52c7df70a9e376900f5ae6e732f34e104d43dae33' 
  AND token = 'AaB4+zXUn9c6fk57FZTcf8OikW2E4KcxagyR+D2HEZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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