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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ba353a027fb65261800c52b51bed6d03b233e6780a968c72b572d89935cfaf' 
  AND token = 'iL88TyWqS78lHFB5ult1hqajvesU/p2CqXgCPxhFIr4=' 
  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"
    }
  }
}