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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e352ca3caaaf5da5b734ba5e1e8a056f026a511e08d8cc4d05f657416f56d2c' 
  AND token = 'vXw8y3Z54BQckpZgPHNfGGIiAiCUCMDJRqClo+gOWNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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