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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f89cf930fa5eb0a19b47ae115eff537050bbf3352292ca1e9c1dd8845874a8' 
  AND token = 'XiuzcCIhaQeknvgh/Zx5Fn+ObZybWxhFZXx1fsTQv1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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