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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61788bf736647104814521b80bb4f4346f7d656f81d47e50f333c8fb2338b98' 
  AND token = '4cYz30UivHs1mgsJtiLsYnT+LlD6/TVy94q2HolKaSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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