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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c503b61b750143d63ead95986abbe593f905a47a391ac9b3129d389b7e7006f6' 
  AND token = 'k43v7WyPdJhJOH7NVFwvK7tVx5b8tnIE8Hdi0DlajlY=' 
  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"
    }
  }
}