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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f3d62735ba2fe341e3fadbc2620a1ad46de92db5fe301f92fb173a7f0c9d2e' 
  AND token = 'pLwY7qeXL/ei8YKopLzd4gVyRqR4WykOBWqz3BwaLoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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